What is the influence of meso-scale forcing on the ionosphere-thermosphere system?
What is the influence of meso-scale forcing on the ionosphere-thermosphere system?
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中尺度强迫对电离层-热层系统有何影响？
DOI：
10.5194/egusphere-egu2020-12553
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Yue Deng
中科院分区：
文献类型：
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作者：
Yue Deng
我们提出了一项系统的研究，跨越数据分析和模式模拟，以改善电离层-热层（IT）系统的能量和动量输入规范，特别是在中尺度，以及系统响应。我们的结果被组织成两部分，来自上方和下方的中尺度强迫。首先，利用卫星和地面测量分析了来自磁层的中尺度强迫，包括流暴、电场变率、中尺度粒子降水和场向电流（FAC）。然后在全球电离层-热层模式（GITM）中实现强迫分布，以评估中尺度强迫对电离层-热层（I-T）系统的相对贡献。其次，由飓风和火山等地理事件触发的声波重力波从低层大气传播到地面，对全球卫星导航系统（GNSS）产生可观测的扰动。利用局域网格细化GITM （GITM- r）模拟了这些事件引起的电离层总电子含量（TEC）变化，并与GNSS观测结果进行了比较。这些高分辨率模拟将有力地增强我们对I-T系统中尺度强迫的理解和能力。
We present a systematical study crossing both data analysis and model simulation to improve the specification of the energy and momentum inputs into the ionosphere-thermosphere (IT) system, especially at meso-scale, and the system response. Our results are organized in two parts, mesoscale forcing from above and from below. First, the meso-scale forcing from magnetosphere including flow burst, electric field variability, meso-scale particle precipitation and field-aligned current (FAC) has been analyzed using both satellite and ground-based measurements. The forcing distributions are then implemented in the Global Ionosphere-Thermosphere Model (GITM) to assess the relative contributions of meso-scale forcing to the ionosphere-thermosphere (I-T) system. Secondly, the acoustic gravity waves (AGWs) trigged by the geographic events, such as hurricane and volcano, propagate from lower atmosphere to I-T and cause disturbances observable for the Global Navigation Satellite Systems (GNSS). GITM with local-grid refinement (GITM-R) has been utilized to simulate ionospheric total electron content (TEC) variations induced by those events and compared with GNSS observations. These high-resolution simulations will strongly enhance our understanding and capability to specify the meso-scale forcing for the I-T system.